Slide-valve gear for steam-engines.



BATENTEDAPR. '7, 1903. S. S. YOUNGHUSBAND.

SLIDE VALVE GEAR FOR STEAM ENGINES.

APPLICATION FILED FEB. 25. 1903.

a sfinE'rs-sHEnT 1.

N0 MODEL.

W/r/vmam PATENTED APR. '7, 1908.

S. S. YOUNGHUSBAND. SLIDE VALVE GEAR FOR STEAM ENGINES.

APPLICATION FILED FEB. 25, 1903.

8 SHEETS-SHEET 2.

N0 MODEL.

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No. 724,990. PATENTED APR. '7, 1903.

S. S. YOUNGHUSBAND.

SLIDE VALVE GEAR FOR STEAM ENGINES.

APPLIGATION FILED FEB. 25, 1903. N0 MODEL. 8 SHEETS-SHEET a.

UNITED STaTEs PATENT UEETQE,

SAMUEL SMITH YOUNGHUSBAND, OF DARLINGTON, ENGLAND, ASSIGNO'R TO GILBERT CHARLES WARD, SR., OF NEWCASTLE, ENGLAND.

SLIDE-=VALVE GEAR FOR STEAlVl ENGlNES.

SPECIFICATION forming part of Letters Patent No. 724,990, dated April '7, 1903.

Application filedIebrnary 25,1903- Serial No. 145,095. (No model.)

To all whom it may concern.- ahead and astern eccentric-rods e f, respec- Be it known that I, SAMUEL SMITH YOUNG- 'tively. The link is supported by being at- HUSBAND, engineer, a subject of the King of tached to the fixed point 7; by means of a pair Great Britain, residing at Granville Terrace, of swing carrier-links j, pivotally connected 5 \Voodlands Road, Darlington, in the county to gudgeons Z, projecting from the outer faces of Durham, England, have invented certain of the link members d d. The axes of the new and useful Improvements in Slide-Valve gudgeons g h intersect the longitudinal cen- Gear for Steam-Engines, of which the followter line a no of each member of the duplex link ing is a specification. cl (1, and the axis of the gu'dgeon Zalso ap- 10 My invention relates to slide-valve reversproximately intersects the same line a: m, as

ing and expansion gear of the kind wherein shown. motion is transmitted from the expansion and The die-block is duplex, its members Workreversing link to the slide-valve through an ing between the plates d d and being guided intermediate lever, which is pivoted to the, by pairs of inwardly-projecting flanges lb u 15 die-block of the link and connected by its thereon. The die-block members are proshorter arm or arms to the valve-rod, while vided with axially-alined adjustable bearings its other and longer arm is pivoted to an arm for a pair of trunnions o n on the outer faces or arms on the Weigh-shaft, the expansion and of the lever 0, through which the oscillations reversing link Vibrating as a whole about a of the die-block are transmitted to the valve- 2o fixed axis, to which it is connected by a pair rod 01. This lever 0 is fulcrumed at q to an of swing carrier-links and the reversal of the arm '1' on the weigh-shaft s, the lever being engine being effected by moving the die-block continued beyond the die-block centerp and along the slot of the link. This type of valvepivoted at t to the valve-rod n, which is thus gear, while specially designed to secure ducaused to reciprocate through a greater dis- 7: 25 rability, cheapness, and compactness, gives tance than if it were coupled direct to the afixed amount of lead with all degrees of linkdie-block. The lever 0 is duplex, its meming-up, a quick-port opening for the admisbers working close to the inner edges of the sion of steam, a quick opening at the comflanges u u and receiving between them the mencement of exhaust, and a much larger ends of the arm 1' and valve-rod n, which 3o steam-port opening and. more sudden cut-off work on the centers q and 25.

than usual for all degrees of linking-up, thus The preferred construction of die-block for enabling the engine to be always readily use with this form of the gear is shown sepastarted. rately' in Fig. 4 and consists of duplex mem- In the accompanying drawings, Figure 1 is bers each made in two parts 'm m, connect- 35 a part sectional side elevation; and Fig. 2, a ed by bolts, as shown, and held apart by plan, partly in section, of the improved gear, wedges 1Q 10, whereby the die-block may be which is shown in mid-position. Fig. 3 is a adjusted to make a sliding fit between the section on line 14 14, Figs. 1 and 2; and Fig. flanges u it of the corresponding link mem- 4 is a side elevation of the die-block shown bers d, the bearing for each trunnion 1; of the 4o separately. Valve-lever 0 being provided by a pair of half- This type of slide-valve gear as applied to bushes z 2', received between and held tomarine engines, while possessing all the adgether by the parts m m of the die-block vantages above referred to, is specially demember. Wear of these trunnion-bearings signed so that every working part can be adis taken up and compensation made for sepa- 45 justed for wear. ration by the wedges w) of the parts an m of The expansion and reversing link is duplex the die-block member by means of liners or in that it consists of a pair of plates cl d, held packing-strips interposed as required at y 3 apart by distance-pieces and bolts, as at d d, between the back of each half-bush ,z' and the link members (1 d carrying on their outer the contiguous inner surface of the corre too 50 faces pairs of gudgeons g g 7t 7t, forming pivsponding die-block part at or m.

otal connections for the forked ends of the The expansion and reve'rsinglink (Z may be curved in the direction shown or in the opposite direction or may be made straight, according to the position of the weigh-shaft, as will be readily understood by any one versed in the art of designing linlomotions. It is also to be observed that by suitably proportioning the length of the valve-rod 'n, the weigh-shaft arm 'r, and the valve-operating lever 0 the constancy of the lead given by this gear to the slide-valve in all positions of the die-block may be maintained whatever the direction or degree of curvature given to the expansion and reversing link.

I claim 1. In marine-engine slide-valve gear of the kind described, the combination of a duplex expansion and reversing link formed of a pair of parallel plates held apart by distance-pieces and having each a pair of inwardly-projecting parallel guide-flanges for the die-block; a duplex die-block formed of a pairof members adjustably fitted to slide between the link members and upon the flanges thereof and having adjustable bearings for the trunnions ofthe valve-operating lever; a valve-operating lever adapted to Work between the link members and having a pair of axially-alined trunnions journale'd in the dieblock bearings; and gudgeons in alined pairs projecting from the outer faces of the link members and approximately intersecting the longitudinal center lines thereof, two of said pairs of gudgeons being situated toward the ends of the link for the attachment of the eccentric-rods and the third pair being situated midway of the others for attachment to swing carrier-links, as described.

2. In marine-engine slide-valve gear of the kind described, the combination with a duplex expansion and reversing link formed of members held apart by distance-pieces and having each a pair of inwardly-projecting parallel guide-flanges, and with a valve-operating lever adapted to work between the link members and having a pair of axially-alined trunnions projecting from its opposite faces, of a duplex die-block whereof the members are adapted to slide between the said link members and upon the guide-flanges thereof; each die-block member being in two parts so held together and so fitted with adjustmentwedges as to permit of Wear being taken up between the die-block and the guide-flanges whereon it works, and each die-block carrying a pair of half-bushes adapted to form a bearing for the corresponding valve lever trunnions and adjustable about the same, as described.

SAMUEL Sllll'lll YOUNGHUSBAND.

\Vitnesses:

ARTHUR F. TAYLOR, W. H. GOLDING. 

